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Speech without conscious awareness

Department of Neurology, Division of Cognitive Neuroscience, Cornell University Medical College, New York, NY.

Following commissurotomy, it is usually the case that information presented to the left hemisphere can be named and described, while information presented to the mute, right hemisphere cannot be spoken about. In the present study, it was discovered that under special test conditions, an MRI-verified, callosally sectioned adult could name or write about information presented to the right hemisphere. Studies revealed this was not an instance of right hemisphere expression. Rather, the right hemisphere was somehow able to program the left hemisphere for a spoken or written response. Further, the studies also showed that the left hemisphere was not consciously aware that it possessed the information transmitted to it by the right half brain.

Address correspondence and reprint requests to Dr. Gazzaniga, New York Hospital-Cornell Medical Center, 525 E. 68th Street, New York, NY 10021.

Supported by USPHS Grant 2-PO1 NS 17778–04 and Jtlvits Neuroscience Investigator Award 1-RO1 NS 22626–01.

Received April 7, 1986. Accepted for publication in final form August 6, 1986.

This article has been cited by other articles:

				M. G. Funnell, P. M. Corballis, and M. S. Gazzaniga Cortical and Subcortical Interhemispheric Interactions Following Partial and Complete Callosotomy Arch Neurol, February 1, 2000; 57(2): 185 - 189. [Full Text] [PDF]